8661191803 has 4 divisors (see below), whose sum is σ = 9448572888. Its totient is φ = 7873810720.

The previous prime is 8661191783. The next prime is 8661191813. The reversal of 8661191803 is 3081911668.

It is a happy number.

8661191803 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8661191803 - 2²⁵ = 8627637371 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8661191803.

It is not an unprimeable number, because it can be changed into a prime (8661191813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393690526 + ... + 393690547.

It is an arithmetic number, because the mean of its divisors is an integer number (2362143222).

Almost surely, 2^8661191803 is an apocalyptic number.

8661191803 is a deficient number, since it is larger than the sum of its proper divisors (787381085).

8661191803 is a wasteful number, since it uses less digits than its factorization.

8661191803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787381084.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 8661191803 is about 93065.5242450178. The cubic root of 8661191803 is about 2053.6474270531.

The spelling of 8661191803 in words is "eight billion, six hundred sixty-one million, one hundred ninety-one thousand, eight hundred three".